Websocket error when trying to use Caddy with Wekan

Help
1

Hi,
I’m getting this websocket error when trying to run Caddy version 0.9 with Wekan:

8e71878….js?meteor_js_resource=true:77 WebSocket connection to 'wss://sub.domain.org/sockjs/263/f5m9n8ej/websocket' failed: Error during WebSocket handshake: Unexpected response code: 400

With this Caddy config:

sub.domain.org {
        proxy / localhost:8080 {
            websocket
        }
}

How to fix?

2

Wekan is running in Docker container on server.

3

It seems that this error is because Websocket is not currently enabled in Google Cloud.

Does somebody know how to enable Websocket in Google Cloud?